Nissan 370Z Forum  

Fancy Tech: How to Get Rid of Exhaust Drone, works great!

Wish I knew about this when I had b&b bullets on my C6. Wife would plug her ears with her fingers for the week I had it. Plus rep!

Go Back   Nissan 370Z Forum > Nissan 370Z Tech Area > Engine & Drivetrain > Intake/Exhaust


Like Tree24Likes

Reply
 
LinkBack Thread Tools Display Modes
Old 08-04-2010, 06:13 PM   #46 (permalink)
The370Z.com Sponsor
 
Mike's Avatar
 
Join Date: Jun 2009
Location: Loganville, GA
Posts: 5,944
Drives: 370z
Rep Power: 2185
Mike has a reputation beyond reputeMike has a reputation beyond reputeMike has a reputation beyond reputeMike has a reputation beyond reputeMike has a reputation beyond reputeMike has a reputation beyond reputeMike has a reputation beyond reputeMike has a reputation beyond reputeMike has a reputation beyond reputeMike has a reputation beyond reputeMike has a reputation beyond repute
Default

Wish I knew about this when I had b&b bullets on my C6. Wife would plug her ears with her fingers for the week I had it. Plus rep!
__________________
NISSAN: 75 280Z / 86 300ZX GLL /87 Sentra SE / 03 350Z / 23 Z
Porsche: 93 968 / 23 Macan GTS / 93 968
Mike is offline   Reply With Quote
Old 08-04-2010, 10:03 PM   #47 (permalink)
A True Z Fanatic
 
docaam's Avatar
 
Join Date: Nov 2009
Location: Dubai
Posts: 2,532
Drives: Z34/240z/Hakosuka
Rep Power: 28
docaam has a reputation beyond reputedocaam has a reputation beyond reputedocaam has a reputation beyond reputedocaam has a reputation beyond reputedocaam has a reputation beyond reputedocaam has a reputation beyond reputedocaam has a reputation beyond reputedocaam has a reputation beyond reputedocaam has a reputation beyond reputedocaam has a reputation beyond reputedocaam has a reputation beyond repute
Default

Quote:
Originally Posted by '10Anamoly View Post
Yes, you have to use a hole saw to open up a 2" to 2.25" hole on the FI exhaust. That is where the sound waves travel through, down the resonator pipe, and back to cancel out the droning frequencies.

It's a trade off, keep the drone and dont touch the pretty exhaust or mod the exhaust and enjoy the silence (lack of drone, depeche mode style).
Im big Depeche mode fan .... just trying to prepare myself to get this done as need it badly, lets see if someone with FI exhausts wants to do before me
docaam is offline   Reply With Quote
Old 08-10-2010, 02:52 AM   #48 (permalink)
A True Z Fanatic
 
docaam's Avatar
 
Join Date: Nov 2009
Location: Dubai
Posts: 2,532
Drives: Z34/240z/Hakosuka
Rep Power: 28
docaam has a reputation beyond reputedocaam has a reputation beyond reputedocaam has a reputation beyond reputedocaam has a reputation beyond reputedocaam has a reputation beyond reputedocaam has a reputation beyond reputedocaam has a reputation beyond reputedocaam has a reputation beyond reputedocaam has a reputation beyond reputedocaam has a reputation beyond reputedocaam has a reputation beyond repute
Default

Quote:
Originally Posted by '10Anamoly View Post
Yes, you have to use a hole saw to open up a 2" to 2.25" hole on the FI exhaust. That is where the sound waves travel through, down the resonator pipe, and back to cancel out the droning frequencies.

It's a trade off, keep the drone and dont touch the pretty exhaust or mod the exhaust and enjoy the silence (lack of drone, depeche mode style).
Man when you posted this thread car was in workshop and I have been calculating this drone on rpm range...the vibration starts at 2100 and is there till 2800 depends on the gear and speed as sometime it dies on 2700. Its more if you stay in single gear and accelerate slowly all the way till 3000, but if you push the pedal hard then its a bit less.

So can you throw some light according to your calculations as I have no means to measure those frequencies.

For the pipes does those be in SS or normal exhaust pipe will do the trick. I am about to pull the trigger by making hole in FI exhausts
docaam is offline   Reply With Quote
Old 08-10-2010, 08:14 AM   #49 (permalink)
Track Member
 
'10Anamoly's Avatar
 
Join Date: May 2010
Location: GA
Posts: 882
Drives: 2010 370Z BS M6
Rep Power: 15
'10Anamoly is a glorious beacon of light'10Anamoly is a glorious beacon of light'10Anamoly is a glorious beacon of light'10Anamoly is a glorious beacon of light'10Anamoly is a glorious beacon of light
Default

Since the FI setup is the same pretty much as mine and the drone in is the same range, I would use 28-30" pipes, one per side. Any shorter and it will tune out drone above 3000rpms where you dont have the problem. Regular steel is fine but I would use some hi-temp paint to keep it from rusting ever.
__________________
2013 Ford Mustang GT

374rwhp, 360rwtq SAE / GT500 Axle-Backs / Brembo Pack / Track Pack / Recaros / 6spd
'10Anamoly is offline   Reply With Quote
Old 08-10-2010, 08:26 AM   #50 (permalink)
A True Z Fanatic
 
docaam's Avatar
 
Join Date: Nov 2009
Location: Dubai
Posts: 2,532
Drives: Z34/240z/Hakosuka
Rep Power: 28
docaam has a reputation beyond reputedocaam has a reputation beyond reputedocaam has a reputation beyond reputedocaam has a reputation beyond reputedocaam has a reputation beyond reputedocaam has a reputation beyond reputedocaam has a reputation beyond reputedocaam has a reputation beyond reputedocaam has a reputation beyond reputedocaam has a reputation beyond reputedocaam has a reputation beyond repute
Default

Thanks will plan the operation then

how do you measure like someone would need 28" or 30" or less?
docaam is offline   Reply With Quote
Old 08-10-2010, 09:19 AM   #51 (permalink)
Track Member
 
'10Anamoly's Avatar
 
Join Date: May 2010
Location: GA
Posts: 882
Drives: 2010 370Z BS M6
Rep Power: 15
'10Anamoly is a glorious beacon of light'10Anamoly is a glorious beacon of light'10Anamoly is a glorious beacon of light'10Anamoly is a glorious beacon of light'10Anamoly is a glorious beacon of light
Default

Speed of sound (typically 1100ft/sec, divided by the frequency at which drone occurs, divided by four because you want it to reflect at 1/4 the drone wavelength to cancel it out).

So for drone around 110hz-112hz (around my setup), you get to 2.5 to 2.4 ft, or 29-30".
__________________
2013 Ford Mustang GT

374rwhp, 360rwtq SAE / GT500 Axle-Backs / Brembo Pack / Track Pack / Recaros / 6spd
'10Anamoly is offline   Reply With Quote
Old 10-04-2010, 01:00 PM   #52 (permalink)
Base Member
 
Join Date: Sep 2010
Location: In your Internets
Posts: 118
Drives: 09 370z 7AT
Rep Power: 14
J. Dub is on a distinguished road
Default

So fast intentions CBE drones.... I had no idea. Glad I didn't buy it last week.
J. Dub is offline   Reply With Quote
Old 10-04-2010, 01:09 PM   #53 (permalink)
Track Member
 
Join Date: Jul 2009
Location: CHINO
Posts: 957
Drives: Black 350z/370z
Rep Power: 16
TeamARK is on a distinguished road
Default

But this exhaust doesn't
ARK PERFORMANCE INC : 370z TRUE DUAL Prototype Teaser w/ dB Test.
TeamARK is offline   Reply With Quote
Old 10-04-2010, 02:54 PM   #54 (permalink)
Track Member
 
Huan'z's Avatar
 
Join Date: Apr 2010
Location: houston,texas
Posts: 641
Drives: black 370z 7/AT.
Rep Power: 15
Huan'z is on a distinguished road
Default

We need to confirm with Tony of f.I and let's see what his advice. I believe Tony tried a Lot of things before he decided to make his cbe. So give him a shot and wait for his respond. That's just only my own idea.
Huan'z is offline   Reply With Quote
Old 10-04-2010, 04:52 PM   #55 (permalink)
A True Z Fanatic
 
theDreamer's Avatar
 
Join Date: Feb 2009
Location: Texas
Posts: 30,879
Drives: 370z
Rep Power: 4210
theDreamer has a reputation beyond reputetheDreamer has a reputation beyond reputetheDreamer has a reputation beyond reputetheDreamer has a reputation beyond reputetheDreamer has a reputation beyond reputetheDreamer has a reputation beyond reputetheDreamer has a reputation beyond reputetheDreamer has a reputation beyond reputetheDreamer has a reputation beyond reputetheDreamer has a reputation beyond reputetheDreamer has a reputation beyond repute
Default

Quote:
Originally Posted by J. Dub View Post
So fast intentions CBE drones.... I had no idea. Glad I didn't buy it last week.
Might want to check the Fast Intentions thread before making a conclusion. I get mine this week and should have a full review soon, then again there are already over a 100 reviews of the exhaust.
__________________
theDreamer's Z // Fast Intentions // Uprev // GTM // HKS // TEIN
theDreamer's Silvia // URAS // GREDDY
Houston Zs // Facebook // Twitter // Instagram
theDreamer is offline   Reply With Quote
Old 10-04-2010, 05:30 PM   #56 (permalink)
Track Member
 
Huan'z's Avatar
 
Join Date: Apr 2010
Location: houston,texas
Posts: 641
Drives: black 370z 7/AT.
Rep Power: 15
Huan'z is on a distinguished road
Default

with thedreamer. And take a look how many sets Tony sell out. I'm one of his customer still waiting for his cbe. And didn't hear anything like drone or whatever negative from other forum member. So let's wait from thedreamer. Hey bro keep us updated. Whenever u got yours and installed. Let me know so I can meet up with u. I want to hear from it and see how's good is it.
Huan'z is offline   Reply With Quote
Old 10-04-2010, 05:50 PM   #57 (permalink)
A True Z Fanatic
 
phelan's Avatar
 
Join Date: Apr 2009
Location: CA
Age: 38
Posts: 9,513
Drives: Scoobaroo
Rep Power: 3405
phelan has a reputation beyond reputephelan has a reputation beyond reputephelan has a reputation beyond reputephelan has a reputation beyond reputephelan has a reputation beyond reputephelan has a reputation beyond reputephelan has a reputation beyond reputephelan has a reputation beyond reputephelan has a reputation beyond reputephelan has a reputation beyond reputephelan has a reputation beyond repute
Default

Quote:
Originally Posted by TeamARK View Post
wow, shameless plug much?

Quote:
Originally Posted by '10Anamoly View Post
Speed of sound (typically 1100ft/sec, divided by the frequency at which drone occurs, divided by four because you want it to reflect at 1/4 the drone wavelength to cancel it out).

So for drone around 110hz-112hz (around my setup), you get to 2.5 to 2.4 ft, or 29-30".
So...to get the frequencies of your droning, you put a microphone to your exhaust and ran it through a spectrum analyzer (i.e. Audacity if you're not in a lab...haha) to get the peak frequencies? Out of curiosity, did you run any filters on the output, or was it all raw? How clean was the data?

Nothing serious, just piqued my curiosity. I like reading stuff like this.
__________________

凛 ('Rin') - 2009 Nissan 370Z
With silence comes peace. With peace comes freedom. With freedom comes silence.
phelan is offline   Reply With Quote
Old 10-04-2010, 06:09 PM   #58 (permalink)
WFLYIDNNE
 
XwChriswX's Avatar
 
Join Date: Jul 2009
Location: In The Fastlane
Posts: 50,648
Drives: 02 GDB WRX
Rep Power: 451
XwChriswX has a reputation beyond reputeXwChriswX has a reputation beyond reputeXwChriswX has a reputation beyond reputeXwChriswX has a reputation beyond reputeXwChriswX has a reputation beyond reputeXwChriswX has a reputation beyond reputeXwChriswX has a reputation beyond reputeXwChriswX has a reputation beyond reputeXwChriswX has a reputation beyond reputeXwChriswX has a reputation beyond reputeXwChriswX has a reputation beyond repute
Default

Quote:
Originally Posted by phelan View Post
Nothing serious, just piqued my curiosity. I like reading stuff like this.
__________________

Bonnie - Stage 2, Audio build coming this fall!
R.I.P. Abby 3/29/10 - 3/30/14
XwChriswX is offline   Reply With Quote
Old 10-05-2010, 01:02 AM   #59 (permalink)
A True Z Fanatic
 
docaam's Avatar
 
Join Date: Nov 2009
Location: Dubai
Posts: 2,532
Drives: Z34/240z/Hakosuka
Rep Power: 28
docaam has a reputation beyond reputedocaam has a reputation beyond reputedocaam has a reputation beyond reputedocaam has a reputation beyond reputedocaam has a reputation beyond reputedocaam has a reputation beyond reputedocaam has a reputation beyond reputedocaam has a reputation beyond reputedocaam has a reputation beyond reputedocaam has a reputation beyond reputedocaam has a reputation beyond repute
Default

Running FI exhausts for few months now, I can say the exhaust sounds awesome but what OP was referring to was not the normal drone (I can live with that) but vibration because of it. I do face that if I accelerate the car slowly(normal crusing) not pushing it hard as rpms has to go steady from 2k to 3k and its there for good 500 - 700, mine starts from 2200 and lasts till 2800.

This thread shouldn't be taken anything against FI as they are an awesome company with awesome product, its just people have their own preferences. My daughter(7yrs) hates this drone and avoid sitting in the car LOL. I went through doing a DYNAMAT sound proofing when upgrading the audio it has reduced this vibration (not talking about drone/sound/noise) but its still there and if Tony gives some input on this thread I am willing to do this DIY
docaam is offline   Reply With Quote
Old 11-04-2010, 08:39 PM   #60 (permalink)
Base Member
 
Join Date: Nov 2010
Location: CT
Posts: 1
Drives: 07 350z MT touring
Rep Power: 14
hr350z is on a distinguished road
Default

Will this only work after the muffler? I have a single exhaust on my 350 and there really is no way of doing this after the muffler.

side note: not to go too far off topic will HFC's cause more drone?
hr350z is offline   Reply With Quote
Reply

Bookmarks

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On


Similar Threads
Thread Thread Starter Forum Replies Last Post
Anyone thought about a Hi-Tech Exhaust? joe370z Australia/New Zealand 6 05-05-2014 12:24 AM
Failsafe Performance- Great deals on Tein S. Tech springs!! Chris@FsP Suspension/Brakes 26 10-06-2010 10:20 AM
Stillen HFC drone? ducatismo Engine & Drivetrain 3 07-01-2010 02:42 PM
reducing drone Zsteve Intake/Exhaust 39 11-28-2009 08:54 AM


All times are GMT -5. The time now is 09:27 AM.


Powered by vBulletin® Version 3.8.4
Copyright ©2000 - 2024, Jelsoft Enterprises Ltd.
Search Engine Optimization by vBSEO 3.6.0 PL2